For the sake of reduction of reducing agent in blast furnace and making use of low-quality iron ore and coals, the use of ferro coke containing metallic iron as a catalyst was proposed to control the thermal reserve zone temperature. In the production of ferro coke, a vertical shaft furnace is used to realize the optimum carbonizing and pre-reduction process. To optimize the heating process of the shaft furnace, visualization of the temperature distributions inside the shaft furnace is important. In this study, a new simulation technology is developed to visualize the gas flow and the temperature distribution of the briquettes inside the shaft furnace. In the simulation method, both gas flows and solid flows are modeled by the finite volume method so that we can obtain simulation results within a reasonable computation time. Simulation results show that we achieved a good temperature profile in the shaft furnace in the final test campaigns in Keihin works.